אסיף מאגר המחקר החקלאי

Control of Verticiilium Dahliae prior to potato production by soil fumigation with chloropicrin

Year:

2000

Source of publication :

Authors :

Volume :

532

Co-Authors:

Tsror, L., Agricultural Research Organization, Dep. of Plant Pathology, Gilat Experiment Station, M.P. Negev, 85280, Israel
Erlich, O., Agricultural Research Organization, Dep. of Plant Pathology, Gilat Experiment Station, M.P. Negev, 85280, Israel
Peretz-Alon, I., Maon Enterprises, M.P. Negev, Israel
Cahlon, Y., Agrichem Ltd., Petah Tikva, Israel
Hadar, A., Agrichem Ltd., Petah Tikva, Israel
Cohen, Y., Agrichem Ltd., Petah Tikva, Israel
Klein, L., Agrichem Ltd., Petah Tikva, Israel

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Abstract:

Potato early dying syndrome caused primarily by Verticillium dahliae may cause up to 50% yield loss in susceptible cultivars. The pathogen produces microsclerotia that infest the soil. One of the control means is soil fumigation. The objective of the present study was to evaluate the efficiency of telopic in controlling soilborne pathogens, prior to potato growing. Field experiments were conducted during autumns of 1998 and 1999 in southern Israel. At experiment I (Gilat) the incidence of infected plants and dry stems carrying microsclerotia were significantly reduced by 17 and 35% telopic and methyl bromide. Colonization levels of the fungus in the control were significantly higher than in all fumigation treatments. Yield obtained in the control was 22% lower than in the other treatments. At experiment II (Besor) disease incidence was reduced to zero by methyl bromide and telopic 35, by 86% with bromopic and only by 41% with fordor. The incidence of infected dry stems was similarly affected. Yields obtained from plots treated with bromopic, telopic 35 and methyl bromide were significantly higher than those treated with fordor and the control. At experiment III (Gilat, 1999) colonization levels, incidence of disease and infected dry stems were significantly reduced by all telopic 35 and methyl bromide treatments applied with plastic covering, as compared with telopic without plastic and the control. In summary, telopic effectively reduced Verticillium and thus can be used as a soil fumigant prior to potato.

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